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//
// rotl.cpp
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
// Defines _lrotl(), _rotl(), and _rotl64(), which perform a rotate-left on an
// integer.
//
#include <stdlib.h>
#include <limits.h>
#pragma function(_lrotl, _rotl, _rotl64)
#if UINT_MAX != 0xffffffff
#error This source file assumes 32-bit integers
#endif
#if UINT_MAX != ULONG_MAX
#error This source file assumes sizeof(int) == sizeof(long)
#endif
extern "C" unsigned long __cdecl _lrotl(unsigned long value, int shift)
{
shift &= 0x1f;
value = (value >> (0x20 - shift)) | (value << shift);
return value;
}
extern "C" unsigned __cdecl _rotl(unsigned value, int shift)
{
shift &= 0x1f;
value = (value >> (0x20 - shift)) | (value << shift);
return value;
}
extern "C" unsigned __int64 __cdecl _rotl64(unsigned __int64 value, int shift)
{
shift &= 0x3f;
value = (value >> (0x40 - shift)) | (value << shift);
return value;
}